Knowing the quantity of BTCs mined each day and the trading volumes on MTGox, is it possible to understand what is the percentage of BTCs mined and immediately sold by miners currently?
Who mines the blocks? Mostly pools. So the pools do have payouts that might be tracked, but you can't know if the individual payouts are to hosted (shared) EWallet addresses or addresses for local Bitcoin clients.
There are still many block mined back before pools existed in which still have not been spent. So with those it can be determined that they haven't been sold. But nowadays that's pretty much impossible to determine.
Welcome to the world of pseudonymous digital currency.
